{"id":4019,"date":"2024-05-06T08:30:52","date_gmt":"2024-05-06T00:30:52","guid":{"rendered":"https:\/\/xinchewhd.com.cn\/index.php\/%e9%9d%a2%e8%af%95\/%e9%9d%a2%e8%af%95%e5%ae%98%ef%bc%9aconcurrenthashmap%e6%98%af%e5%a6%82%e4%bd%95%e5%9c%a8%e4%b8%8d%e5%ae%8c%e5%85%a8%e9%94%81%e5%ae%9a%e7%9a%84%e6%83%85%e5%86%b5%e4%b8%8b%e5%ae%9e%e7%8e%b0%e7%ba%bf\/"},"modified":"2024-05-06T08:30:52","modified_gmt":"2024-05-06T00:30:52","slug":"%e9%9d%a2%e8%af%95%e5%ae%98%ef%bc%9aconcurrenthashmap%e6%98%af%e5%a6%82%e4%bd%95%e5%9c%a8%e4%b8%8d%e5%ae%8c%e5%85%a8%e9%94%81%e5%ae%9a%e7%9a%84%e6%83%85%e5%86%b5%e4%b8%8b%e5%ae%9e%e7%8e%b0%e7%ba%bf","status":"publish","type":"post","link":"https:\/\/xinchewhd.com.cn\/index.php\/%e9%9d%a2%e8%af%95\/%e9%9d%a2%e8%af%95%e5%ae%98%ef%bc%9aconcurrenthashmap%e6%98%af%e5%a6%82%e4%bd%95%e5%9c%a8%e4%b8%8d%e5%ae%8c%e5%85%a8%e9%94%81%e5%ae%9a%e7%9a%84%e6%83%85%e5%86%b5%e4%b8%8b%e5%ae%9e%e7%8e%b0%e7%ba%bf\/","title":{"rendered":"\u9762\u8bd5\u5b98\uff1aConcurrentHashMap\u662f\u5982\u4f55\u5728\u4e0d\u5b8c\u5168\u9501\u5b9a\u7684\u60c5\u51b5\u4e0b\u5b9e\u73b0\u7ebf\u7a0b\u5b89\u5168\u7684\uff1f"},"content":{"rendered":"
\n

ConcurrentHashMap \u5728 Java \u4e2d\u662f\u4e00\u4e2a\u7ebf\u7a0b\u5b89\u5168\u7684\u54c8\u5e0c\u8868\uff0c\u5b83\u901a\u8fc7\u5206\u6bb5\u9501\uff08Segmentation\uff09\u7684\u6982\u5ff5\u6765\u5141\u8bb8\u5e76\u53d1\u8bbf\u95ee\u3002\u4eceJava 8\u5f00\u59cb\uff0c\u5176\u5185\u90e8\u5b9e\u73b0\u53d1\u751f\u4e86\u53d8\u5316\uff0c\u4ee5\u8fdb\u4e00\u6b65\u4f18\u5316\u6027\u80fd\u3002\u4e0b\u9762\u662f\u8fd9\u4e24\u4e2a\u7248\u672c\u7684\u7b80\u8981\u8bf4\u660e\uff1a<\/span><\/p>\n

Java 7 \u53ca\u4e4b\u524d\u7248\u672c\uff1a<\/span><\/strong><\/h3>\n

\u5728 Java 7 \u53ca\u4ee5\u524d\u7248\u672c\u4e2d\uff0cConcurrentHashMap \u4f7f\u7528\u5206\u6bb5\u9501\uff08Segments\uff09\uff0c\u7c7b\u4f3c\u4e8e\u4e00\u4e2a\u5185\u90e8\u7684\u54c8\u5e0c\u8868\u6570\u7ec4\uff0c\u6bcf\u4e2a\u54c8\u5e0c\u8868\u5c31\u662f\u4e00\u4e2aSegment\u3002\u6bcf\u4e2aSegment \u7ba1\u7406\u7740\u5b83\u81ea\u5df1\u7684\u4e00\u90e8\u5206\u6570\u636e\uff0c\u5e76\u4e14\u6bcf\u4e2aSegment\u90fd\u6709\u81ea\u5df1\u7684\u9501\u3002\u5f53\u9700\u8981put\u6216get\u64cd\u4f5c\u65f6\uff0c\u6839\u636e\u952e\u503c\u8ba1\u7b97\u5f97\u5230\u5bf9\u5e94\u7684Segment\uff0c\u7136\u540e\u53ea\u5bf9\u8be5Segment\u52a0\u9501\u3002\u8fd9\u610f\u5473\u7740\u591a\u7ebf\u7a0b\u64cd\u4f5c\u4e0d\u540cSegment\u65f6\u53ef\u4ee5\u540c\u65f6\u8fdb\u884c\uff0c\u56e0\u6b64\u5927\u5e45\u5ea6\u63d0\u9ad8\u4e86\u5e76\u53d1\u6027\u80fd\u3002\u8fd9\u91cc\u4e0d\u5177\u4f53\u5c55\u5f00\u5bf9Java 7\u4e4b\u524d\u7248\u672c\u7684\u8ba8\u8bba\u3002<\/span><\/span><\/p>\n

Java 8 \u53ca\u4e4b\u540e\u7248\u672c\uff1a<\/span><\/strong><\/h3>\n

\u5728JDK 8\u53ca\u4e4b\u540e\u7684\u7248\u672c\u4e2d\uff0cConcurrentHashMap\u5b9e\u73b0\u7ebf\u7a0b\u5b89\u5168\u7684\u5173\u952e\u5728\u4e8e\u5b83\u91c7\u7528\u4e86\u7ec6\u7c92\u5ea6\u7684\u9501\u673a\u5236\u4ee5\u53ca\u65e0\u9501\u7684\u64cd\u4f5c\u6765\u964d\u4f4e\u9501\u7ade\u4e89\uff0c\u4ece\u800c\u5141\u8bb8\u591a\u4e2a\u7ebf\u7a0b\u5e76\u53d1\u5730\u64cd\u4f5c\u4e0d\u540c\u6570\u636e\u6bb5\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u8be6\u7ec6\u7684\u7b56\u7565\uff1a<\/span><\/p>\n

    \n
  1. \n

    CAS\uff08Compare-And-Swap\uff09<\/span>:<\/span><\/p>\n<\/li>\n

    \u5bf9\u4e8e\u67d0\u4e9b\u5173\u952e\u53d8\u91cf\u7684\u66f4\u65b0\u64cd\u4f5c\uff0cConcurrentHashMap\u4f7f\u7528\u539f\u5b50\u7684CAS\u64cd\u4f5c\uff0c\u8fd9\u662f\u4e00\u79cd\u4e50\u89c2\u9501\u6280\u672f\u3002CAS\u4f1a\u5728\u4e0d\u963b\u585e\u5176\u4ed6\u7ebf\u7a0b\u7684\u60c5\u51b5\u4e0b\u8fdb\u884c\u53d8\u91cf\u66f4\u65b0\uff1a\u5b83\u6bd4\u8f83\u5f53\u524d\u53d8\u91cf\u7684\u503c\u662f\u5426\u4e0e\u9884\u671f\u7684\u65e7\u503c\u76f8\u7b49\uff0c\u5982\u679c\u76f8\u7b49\u5219\u66f4\u65b0\u4e3a\u65b0\u503c\u3002\u8fd9\u6837\u53ef\u4ee5\u907f\u514d\u4f7f\u7528\u4f20\u7edf\u7684\u4e92\u65a5\u9501\u3002<\/span><\/p>\n

  2. \n
    \u7ec6\u7c92\u5ea6\u7684\u9501\u5b9a:<\/span><\/section>\n<\/li>\n

    ConcurrentHashMap\u4e2d\u7684\u6bcf\u4e2a\u6876\u6761\u76ee\u90fd\u53ef\u4ee5\u72ec\u7acb\u52a0\u9501\uff0c\u53ea\u6709\u5f53\u7ebf\u7a0b\u9700\u8981\u5bf9\u7279\u5b9a\u8282\u70b9\u8fdb\u884c\u4fee\u6539\u65f6\uff0c\u624d\u4f1a\u5bf9\u8be5\u8282\u70b9\u52a0\u9501\u3002\u8fd9\u610f\u5473\u7740\u540c\u65f6\u53ea\u9501\u5b9a\u4e86\u6570\u636e\u7ed3\u6784\u7684\u4e00\u5c0f\u90e8\u5206\uff0c\u4ece\u800c\u4f7f\u5f97\u5176\u4ed6\u7ebf\u7a0b\u53ef\u4ee5\u8bbf\u95ee\u548c\u4fee\u6539\u5176\u4ed6\u672a\u88ab\u9501\u5b9a\u7684\u8282\u70b9\u3002<\/span><\/p>\n

  3. \n

    \u94fe\u8868\u8f6c\u7ea2\u9ed1\u6811:<\/span><\/p>\n<\/li>\n

    \u5982\u679c\u6876\u4e2d\u7684\u94fe\u8868\u8fc7\u957f\uff0c\u5c06\u5176\u8f6c\u6362\u4e3a\u5e73\u8861\u7684\u7ea2\u9ed1\u6811\uff0c\u53ef\u4ee5\u63d0\u9ad8\u641c\u7d22\u6548\u7387\u3002\u5728\u8f6c\u6362\u8fc7\u7a0b\u4e2d\u53ef\u80fd\u9700\u8981\u9501\u5b9a\u76f8\u5173\u7684\u94fe\u8868\u90e8\u5206\uff0c\u4f46\u662f\u8bfb\u53d6\u64cd\u4f5c\u901a\u5e38\u4e0d\u53d7\u5f71\u54cd\u3002<\/span><\/span><\/p>\n

  4. \n

    \u5206\u79bb\u7684\u8bfb\u5199\u64cd\u4f5c:<\/span><\/p>\n<\/li>\n

    \u5927\u90e8\u5206\u8bfb\u64cd\u4f5c\uff08\u5982get()\u65b9\u6cd5\uff09\u901a\u5e38\u662f\u65e0\u9501\u7684\uff0c\u56e0\u4e3a\u5b83\u4eec\u53ef\u4ee5\u5b89\u5168\u5730\u8bfb\u53d6\u5230\u6700\u65b0\u7684\u3001\u7531\u5199\u64cd\u4f5c\u4fdd\u8bc1\u5df2\u6b63\u786e\u53d1\u5e03\u7684\u503c\u3002\u5199\u64cd\u4f5c\uff08\u5982put()\u6216remove()\uff09\u5219\u9700\u786e\u4fdd\u901a\u8fc7\u9501\u5b9a\u7279\u5b9a\u7684\u6876\u6765\u5b9e\u73b0\u7ebf\u7a0b\u5b89\u5168\u3002<\/span><\/p>\n

  5. \n

    synchronized\u5173\u952e\u5b57:<\/span><\/p>\n<\/li>\n

    JDK 8\u6539\u8fdb\u4e86\u9501\u673a\u5236\uff0c\u5728\u8282\u70b9\u7ea7\u522b\u4e0a\u4f7f\u7528\u5185\u7f6e\u9501\uff08\u5373synchronized\u5173\u952e\u5b57\uff09\u3002\u5f53\u66f4\u65b0\u8282\u70b9\u65f6\uff0c\u53ea\u6709\u5f53\u524d\u8282\u70b9\u88ab\u9501\u5b9a\uff0c\u5176\u4ed6\u8282\u70b9\u7684\u64cd\u4f5c\u4ecd\u7136\u53ef\u4ee5\u5e76\u884c\u6267\u884c\u3002<\/span><\/p>\n

  6. \n

    \u5f31\u4e00\u81f4\u6027\u8fed\u4ee3\u5668:<\/span><\/p>\n<\/li>\n

    ConcurrentHashMap\u4e2d\u7684\u8fed\u4ee3\u5668\u5177\u6709\u5f31\u4e00\u81f4\u6027\uff0c\u8fd9\u610f\u5473\u7740\u5b83\u4eec\u80fd\u591f\u53cd\u6620\u51fa\u96c6\u5408\u5728\u8fed\u4ee3\u5668\u521b\u5efa\u65f6\u6216\u8fed\u4ee3\u8fc7\u7a0b\u4e2d\u7684\u72b6\u6001\u3002\u867d\u7136\u8fed\u4ee3\u5668\u4e2d\u7684\u5143\u7d20\u53ef\u80fd\u4e0d\u53cd\u6620\u96c6\u5408\u7684\u6240\u6709\u6700\u65b0\u53d8\u5316\uff0c\u4f46\u5b83\u4eec\u786e\u4fdd\u4e86\u5728\u6ca1\u6709\u9501\u7684\u60c5\u51b5\u4e0b\u4e5f\u80fd\u5b89\u5168\u5730\u8fdb\u884c\u8fed\u4ee3\u3002<\/span><\/p>\n

  7. \n

    \u6876\u521d\u59cb\u5316\u548c\u6269\u5bb9\u7684\u5ef6\u8fdf\u52a0\u8f7d:<\/span><\/p>\n<\/li>\n

    \u5728\u6876\u6570\u7ec4\u521d\u59cb\u5316\u548c\u6269\u5bb9\u65f6\u4f7f\u7528\u4e86\u5ef6\u8fdf\u52a0\u8f7d\u6280\u672f\uff0c\u8fd9\u6837\u53ef\u4ee5\u51cf\u5c11\u5728\u5b9e\u9645\u9700\u8981\u524d\u5c31\u5206\u914d\u8d44\u6e90\u548c\u52a0\u9501\u7684\u60c5\u51b5\u3002<\/span><\/p>\n<\/ol>\n

    \u8fd9\u79cd\u8bbe\u8ba1\u901a\u8fc7\u9650\u5236\u9501\u7684\u8303\u56f4\u5e76\u4e14\u5229\u7528CAS\u7b49\u65e0\u9501\u64cd\u4f5c\uff0c\u5927\u5927\u51cf\u5c11\u4e86\u9501\u7ade\u4e89\uff0c\u4f7f\u5f97ConcurrentHashMap\u6210\u4e3a\u4e00\u4e2a\u9002\u5408\u9ad8\u5e76\u53d1\u5e94\u7528\u7a0b\u5e8f\u7684\u9ad8\u6548\u7ebf\u7a0b\u5b89\u5168\u96c6\u5408\u3002<\/span><\/p>\n

    <\/mp-style-type><\/p>\n

    \n

    \u672c\u7bc7\u6587\u7ae0\u6765\u6e90\u4e8e\u5fae\u4fe1\u516c\u4f17\u53f7: \u4e92\u8054\u7f51\u9762\u8bd5\u5c0f\u5e2e\u624b <\/p>\n<\/blockquote>\n<\/div>\n","raw":"","protected":false},"excerpt":{"rendered":"

    ConcurrentHashMap \u5728 Java \u4e2d\u662f\u4e00\u4e2a\u7ebf\u7a0b\u5b89\u5168\u7684\u54c8\u5e0c\u8868\uff0c\u5b83\u901a\u8fc7\u5206\u6bb5\u9501\uff08Segmentation\uff09\u7684\u6982\u5ff5\u6765\u5141\u8bb8\u5e76 …<\/p>\n","protected":false},"author":1,"featured_media":4016,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"emotion":"","emotion_color":"","title_style":"","license":"","footnotes":""},"categories":[30],"tags":[],"class_list":["post-4019","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-30"],"post_thumbnail_image":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/2024\/05\/20240524144528730-150x150.jpeg","content_first_image":null,"post_medium_image_300":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/2024\/05\/20240524144528730-300x128.jpeg","post_thumbnail_image_624":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/2024\/05\/20240524144528730-1024x437.jpeg","post_frist_image":null,"post_medium_image":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/2024\/05\/20240524144528730-300x128.jpeg","post_large_image":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/2024\/05\/20240524144528730-1024x437.jpeg","post_full_image":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/2024\/05\/20240524144528730.jpeg","post_all_images":[],"videoAdId":"","listAd":"0","listAdId":"","listAdEvery":6,"total_comments":0,"category_name":"\u9762\u8bd5","post_date":"2024-05-06","like_count":"0","praiseWord":"\u9f13\u52b1","copyright_state":"","excitationAd":"0","rewardedVideoAdId":"","detailAdId":"","detailAd":"0","enterpriseMinapp":"0","audios":[],"postImageUrl":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/2023\/05\/20230519082947553.jpg","avatarurls":[],"related_posts":null,"pageviews":287,"next_post_id":4015,"next_post_title":"\u9762\u8bd5\u5b98\uff1aConcurrentHashMap\u7684\u8fed\u4ee3\u5668\u662f\u5f31\u4e00\u81f4\u6027\u7684\uff0c\u8bf7\u89e3\u91ca\u8fd9\u610f\u5473\u7740\u4ec0\u4e48\uff1f","previous_post_id":4023,"previous_post_title":"\u9762\u8bd5\u5b98\uff1aConcurrentHashMap\u5141\u8bb8\u591a\u5c11\u4e2a\u7ebf\u7a0b\u540c\u65f6\u5199\u5165\uff1f","_links":{"self":[{"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/posts\/4019","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/comments?post=4019"}],"version-history":[{"count":0,"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/posts\/4019\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/media\/4016"}],"wp:attachment":[{"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/media?parent=4019"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/categories?post=4019"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/tags?post=4019"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}